T61 vs T61P

I’m always asked what’s difference between T61 and T61P. If you have the same question, please read…
Lenovo names T61 as their best processors, fastest graphics and durable, reliable data storage. ThinkPad T Series notebooks are powerful and portable. T Series models are thin, light and offer impressive battery life. It is designed for highly mobile users who work in an office, on the road or anywhere in between. With features such as the latest Intel® Centrino® Pro platform, the choice of integrated or discrete graphics, and numerous display choices including a 15.4-inch and a new 14.1-inch widescreen, the ThinkPad T61 is sure to meet most every need — from student to home business to large enterprise.
Among all T61 laptops, ThinkPad T61p is a mobile workstation that features a faster processor, higher-end discrete graphics, and a sharper-resolution display for users who want a laptop that can handle data- or graphics-intensive applications. The ThinkPad T61p is perfect for video and graphics professionals and other power users/fans because of their need of heavily computation. Thinkpad T61p can be 15.4-inch Widescreen (type 6459) or 14.1-inch screen (type 8891). Please notice that T61p doesn’t come with 14.1-inch Widescreen. All T61p have 256MB Nvidia Quadro FX 570M Graphics chip to ensure the best graphic performance.